Karyological studies were carried out on six bisexual weevil species from five subfamilies, viz. ? Otiorhynchinae, Cleoninae, Curculioninae, Pissodinae, and Hylobiinae. The following chromosome numbers were found in individual species: in Peritelus leucogrammus Germ., Phyllobius cloropus (L.), and Hypera viciae (Gyll.) 2n = 22, n_ = 10+Xyp, in Curculio venosus Grav. 2n= 26, n_ = 12+Xyp, in Magdalis armigera (Foucr.) 2n = 36, n_ = 17+Xyp, in Lixus filiformis (F.) 2n = 44, n_ = 21+Xyp. The heterochromosomes of all the examined species form, in the first meiotic metaphase, a parachute bivalent. The mitoses were observed and analysed in three species. The karyotypes of Peritelus leucogrammus Germ., Phyllobius cloropus (L.), and Curculio venosus Grav. are constituted by metacentric and submetacentric chromosomes.
Karyological details were studied in males of seven weevil species. The following number of chromosomes were found in individual species: 2n=32, n_=15+Xyp in Gymnetron tetrum (F.) and Gymnetron smreczynski Fremuth, 2n=44, n_=21+Xyp in Cionus tuberculosus (Scop.), 2n=38, n_=18+Xyp in Cionus hortulanus (Geoffr.), Cionus ganglbaueri Wingelm. and Cionus nigritarsis Reitt., 2n=42, n_=20+Xyp in Cionus olivieri Rosensch. In the first meiotic metaphase the heterochromosomes of all the examined species formed a typical parachute bivalent. The chromosome number and sex determining system were described for the first time.
Karyological studies were carried out on three Armenian weevil species from the subfamily Cleoninae. The following chromosome numbers were found in individual species: 2n = 38, n% = 18+Xyp in Menecleonus anxius (Gyllenhal, 1824), 2n=40, n% = 19+Xyp in Conorhynchus nigrivittis (Pallas, 1781) and 2n = 44, n% =21+Xyp in Lixus iridis Olivier, 1807. The heterochromosomes of all the examined species form, in the first meiotic metaphase, a typical parachute bivalent.
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